>>43921200Galar. Isle of Armor is a lot more fun to explore than Survival Island, and the characters are more entertaining. They even both come with a battle facility, a customizable area, major characters visiting you, more Pokémon available, and a legendary side quest.
Obviously if you are basing it off of Platinum, Survival Island has more going for it due to the 4 additional battle facilities, but I don’t know, IoA has like 100 raid dens all over and raids are really fun
I like them both but IoA takes the cake for me, it’s really up to whatever you found more entertaining